and some times I get peace of mind from just checking things out. When I was installing the plugs I jammed one of them into the adapter from my compression tester which I didn't realize was stuck in there and screwed up the tip. I tried to bend it back and regap it and I thought it would be okay, but I also wanted to check and see if this plug was fowling or having any problems since that incident. Gonna test the rest of the injectors when I'm off work in the mornign, I was just concerned to know if the discoleration on the plug was a bad sign is all.